How to switch audio between dock audio and bluetooth?

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http://androidforums.com – I have a Galaxy Nexus on Sprint running Android 4.2.1. I use an LG Tone bluetooth headset when walking around during the day, and I have the Nexus car dock with the Pogo Pins for connecting the charger and audio out to my car's aux in. If my bluetooth headset is off, and I put the phone in the dock, all media audio from all sources goes out of the car dock output and into my car's aux in, and everything is fine. Similarly, if the phone is not in the dock, and bluetooth is on, all media sources go to the bluetooth and everything is fine. Unfortunately, if the phone is in the dock and blue (General)